This transaction signer resolves missing signatures in accordance with the given Wallet.MissingSigsMode.
If missingSigsMode is USE_OP_ZERO this signer does nothing assuming missing signatures are already presented in
scriptSigs as OP_0.
In MissingSigsMode.THROW mode this signer will throw an exception. It would be MissingSignatureException
for P2SH or MissingPrivateKeyException for other transaction types.